2025 AMA Research Challenge – Member Premier Access

October 22, 2025

Virtual only, United States

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Background

Shoulder injuries are common in adolescent athletes, particularly in overhead and contact sports. However, comparative data on sport-specific risk profiles remain limited. This study aimed to create risk profiles using strength and range-of-motion (ROM) of the shoulder across high school athletes in baseball, softball, female basketball, female wrestling, and male wrestling.

Methods

We conducted a cross-sectional analysis of 247 high school athletes (159 male, 88 female) from three Utah schools between November 2023 and April 2025. Bilateral shoulder ROM and isometric strength were assessed using goniometry and handheld dynamometry. Primary outcomes included ER:IR strength ratio, internal rotation (IR) asymmetry, and total arc of motion (TROM) asymmetry. Athletes were classified as “at risk” if they met any of the following thresholds: ER:IR ratio < 0.75, IR deficit > 20°, or TROM asymmetry > 10°. Chi-square tests were used for between-group comparisons.

Results

Of the 247 athletes, 57 played baseball, 38 softball, 26 girls’ basketball, 24 girls’ wrestling, and 102 male wrestling. The most prevalent risk factor was ER:IR strength ratio < 0.75, observed in 45% of male wrestlers, 42% of female wrestlers, and 27% of girls’ basketball players. TROM asymmetry > 10° was most common in softball athletes (63%), followed by girls’ basketball (35%) and girls’ wrestling (33%). IR deficits > 20° were uncommon (≤12%) across all groups. Overall, 66% of male wrestlers and 63% of female wrestlers met at least one risk criterion. Significant between-sport differences were observed for ER:IR ratio (p < 0.001) and TROM asymmetry (p = 0.011), but not for IR deficit (p = 0.83).

Conclusion

Distinct sport-specific shoulder risk patterns were identified among adolescent athletes. ER:IR strength imbalance was most common in wrestlers, TROM asymmetry in softball and basketball players, and IR deficits were infrequent. These findings support the need for targeted screening and individualized preventive strategies to address modifiable shoulder injury risk in youth athletes.

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